Ka taea te wehewehe i te hītori whanaketanga o te hangarau oro ki ngā wāhanga e whā: te ngongo, te transistor, te ara iahiko whakauru me te transistor pānga mara.

I te tau 1906, i hangaia e American de Forrest te transistor korehau, koinei te tuatahi o ngā hangarau hiko-orooro a te tangata. I hangaia a Bell Labs i te tau 1927. Whai muri i te hangarau urupare kino, kua uru te whanaketanga o te hangarau oro ki tētahi wā hou, pērā i te whakamahinga angitu a Williamson i te hangarau urupare kino hei whakaiti i te whakapōturi o te whakakaha. I tae te whanaketanga o te whakakaha ngongo ki tētahi o ngā wā tino whakahihiri, ā, ka puta mai ngā momo whakakaha ngongo. Nā te mea he reka, he porowhita te tae oro o te whakakaha ngongo, e pai tonu ana ki ngā kaiwhaiwhai.

I ngā tau 1960, nā te putanga mai o ngā transistors i uru atu ai te tini o ngā kaiwhaiwhai oro ki te ao oro whānui. Ko ngā āhuatanga o ngā whakakaha transistors he oro ngawari, he oro nekeneke, he iti te whakapōturi, he whānui te urupare auau me te whānuitanga hihiri.

I te tīmatanga o te tekau tau atu i 1960, i whakaurua tuatahitia e te Hononga o Amerika ngā ara iahiko whakauru, he mema hou ēnei o te hangarau oro. I te tīmatanga o te tekau tau atu i 1970, i āta mōhiotia ngā ara iahiko whakauru e te umanga oro nā te mea he kounga teitei, he utu iti, he iti te rahinga, he maha ngā mahi me ērā atu. Tae noa ki tēnei wā, kua whānuitia te whakamahinga o ngā ara iahiko whakauru oro kiriata matotoru me ngā ara iahiko whakauru whakakaha mahi i roto i ngā ara iahiko oro.

I waenganui o te tekau tau atu i 1970, i hangaia e Hapani te ngongo tūtohu mahi pānga mara tuatahi. Nā te mea he rite ngā āhuatanga o te ngongo mana pānga mara ki te ngongo irahiko parakore, he matotoru, he reka te tae oro, me te whānuitanga hihiri o te 90 dB, THD < 0.01% (100KHZ), kāore i roa ka rongonui i roto i te oro. I roto i te maha o ngā whakakaha o ēnei rā, ka whakamahia ngā transistors pānga mara hei putanga whakamutunga.

 ULF Pāoro Kawemai e tika ana mō te Kaupapa

Pūoro Whakangahau Whānui 12-inihi